Should fan for generator radiator blow out or suck in?

[dtcerrato]

We tried unsuccessfully several times to quiet our Onan that has the Vacu FLo cooling system (air cooled). We were always going after exhaust noise and insulating the compartment for engine noise. Our recent & last attempt was the most successful. We added a horizontal duct at the hole in the generator floor that blew the Vacu Flo cooling air down to the ground which like has been said raised lots of dust BUT no more with the horizontal duct. It blows the air back. The inside of the duct has a sound attenuating thin layer of 3/8" fiberglass HVAC insulation that quieted the exhaust cooling air tremendously. So to our surprise of the total noise DBs created by: engine exhaust (added full flow muffler and a sound resonator) engine noise (totally closed off air inlet in genny compartment and lined the interior or the adjacent LP compartment with shag carpet & draw the air through that compartment) and exhaust cooling air was of the loudest of all three. We're festinated of the quietness of the genny now. Also added the exhaust system that puts it up over the roof line for congested rallys - works tremendous.

[sledhead]

I like the " shag carpet "

dave

[dtcerrato]

I like the " shag carpet "

dave

Thanks Dave, we have some on the interior too! It's very dated & we love it. Sort of like a "beam us up Scotty" attitude when we're in it...